After a bug in iOS 14 resetting default app preferences was fixed in iOS 14.0.1, a new bug now resets default email and browser apps again, this time when the user-defined apps are updated.
Ios 14.0.1 RSS
Apple today released a series of bug fix updates for all of its operating systems. iOS 14.0.1 and iPadOS 14.0.1 have fixes for default app settings and also some fixes for widgets.